Adaptive frequency selective baseband communications method using orthogonal codes

Abstract

An adaptive frequency selective baseband communications method using orthogonal codes includes: a communications testing step of performing communications by using one of a plurality of codes each having a different frequency band; a proper code selecting step of selecting a proper code by using a correlation value of a plurality of codes included in test data transmitted in the communications testing step; a communications performing step of performing communications by using the proper code; and a feedback step of newly selecting a proper code by using the correlation value of the plurality of codes included in the test data transmitted in the communications performing step if a pre-set time duration has lapsed or if a reception error of more than a pre-set reference occurs, and performing the communications performing step again, wherein the test data transmitted in the communications testing step and the communications performing step includes a plurality of codes each having a different frequency band.

1. An adaptive frequency selective baseband communications method using orthogonal codes, the method comprising:
 a communications testing step of performing communications by using one of a plurality of codes each having a different frequency band; 
 a proper code selecting step of selecting a proper code by using a correlation value of a plurality of codes included in test data transmitted in the communications testing step; 
 a communications performing step of performing communications by using the proper code; and 
 a feedback step of newly selecting a proper code by using the correlation value of the plurality of codes included in the test data transmitted in the communications performing step if a pre-set time duration has lapsed or if a reception error of more than a pre-set reference occurs, and performing the communications performing step again, 
 wherein the test data transmitted in the communications testing step and the communications performing step includes a plurality of codes each having a different frequency band. 
 
     
     
       2. The method of  claim 1 , wherein, in the proper selecting step, correlation values of each of the plurality of codes included in the test data transmitted in the communications testing step are calculated and a code having the smallest correlation value is selected as a proper code. 
     
     
       3. The method of  claim 1 , wherein, in the feedback step, correlation values of each of the plurality of codes included in the test data transmitted in the communications performing step are calculated and a code having the smallest correlation value is newly selected as a proper code, and the communications performing step is performed again. 
     
     
       4. The method of  claim 1 , wherein the test data transmitted in the communications testing step and the communications performing step is included in a header of transmission data transmitted or received in the communications testing step and communications performing step. 
     
     
       5. The method of  claim 1 , wherein, in the communications performing step, communications are performed by changing one or more of a time diversity (TD) degree and a frequency diversity (FD) degree or by changing a modulation degree. 
     
     
       6. An adaptive frequency selective baseband communications method using orthogonal codes, the method comprising:
 a communications testing step of performing communications by using one of a plurality of codes each having a different frequency band; 
 a proper code selecting step of detecting a reception error and selecting a proper code by using the detected reception error; 
 a communications performing step of performing communications by using the proper code; and 
 a feedback step of sequentially repeating the proper code selecting step and the communications performing step continuously while communications are being performed. 
 
     
     
       7. The method of  claim 6 , wherein, in the proper code selecting step, if the detected reception error is smaller than a pre-set reference value, a currently used code is selected as a proper code, whereas if the detected reception error is not smaller than the pre-set reference value, one of the plurality of remaining codes, excluding the currently used code, is selected as a proper code. 
     
     
       8. The method of  claim 6 , wherein, in the communications performing step, communications are performed by changing one or more of a time diversity (TD) degree and a frequency diversity (FD) degree or by changing a modulation degree.